In a side-lying posture, the back should form one straight line, from the neck vertebrae to the sacrum.
In a side/belly posture, the spinal column shall remain in its natural bended form, from the neck to the sacrum, as in an upright posture. Thighbones and knees shall sink a little bit deeper in the mattress, so as not to cause too large a pressure on the lower back.
When sleeping on the back, the spinal column has to keep its natural bended form from the neck to the sacrum. It is important that the lumbar region is supported sufficiently.
In all recumbent postures, an orthopaedically justified support is necessary. The position of the spinal column at night may in no event obstruct the hormonal flows. I hereby refer to the sacro-cranial therapies.
In addition, the dorsal vertebrae must be able to arrange themselves at night so that the intervertebral disks can regenerate optimally. At the same time, the neck and dorsal muscles that are during the daytime most of the time contorted because of an incorrect sitting position must be given a chance to relax.
But, the human body is not a plank. Normally, our shoulders are broader than our hips; but at the hips, we have more weight than at the shoulders.
So, it is clear that the ideal bed for a dominant side sleeper is softer at shoulders’ height and harder at hips’ height. Hard mattresses are a real disaster in terms of support, one really completely tenses up on such mattresses. In this light, no-one will contradict that the saying that hard mattresses are good is a real fable.
Even light persons have to impress their shoulders sufficiently so that the pillow, when used, does not have to carry the weight of the shoulders through the neck.
Orthopaedic pillows on too hard beds shift the problem from the shoulders to the neck. Neck muscles get overloaded and the pressure on the head is much too large. Especially for back-sore people, the mattress has to make it possible that the distance between the shoulder tip and the lumbar region can be impressed by the shoulder. This implies that, independent of the person’s weight, the mattress can at shoulders’ height be impressed 6 to 9 cm, whereas at the hips, that generally weigh more, the mattress cannot be impressed that much. Most certainly for low-back-pain patients and slipped-disk patients, no pressure may be exercised on the lower intervertebral disks. Therefore, in order to offer a perfect linear support, the mattress shall be very elastic without becoming deformed. It shall also have a softer shoulder zone and a slightly harder hip zone, as well as a softer knee zone, if so desired.
The base on which the mattress is lying, shall allow the same support and impression, though in an accentuated way.
The ideal bed is as large as possible, and allows you to optimally stretch out both lengthwise and breadthwise, it allows you to make yourselves as large and as broad as you wish without being hindered by a bed head end, a foot bed end or your partner. For side/belly and belly sleepers, the bed is at least 30 cm and preferably 50 cm longer than the person in question! It must be possible to maximally stretch out the spinal column and to have your body heave on the mattress. This ensures a perfect lateral support.